An image-processing apparatus for processing the image data input from an image-handling device and then outputting the image data to another image-handling device. The apparatus comprises a black-adaptation correction device. The black-adaptation correction device corrects the image data in consideration of the fact that adaptation to black varies from person to person, if the darkest points of the image-handling devices differ from each other. Since the image is so corrected, the colors of the images produced by the image-handling devices look almost the same in spite of the fact that the darkest points of the image-handling devices differ from each other.
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1. An image-processing apparatus for processing the image data input from an image-handling device and then outputting the image data to another image-handling device, said apparatus comprising: black adaptation correction means for correcting the image data, such that colors of the image data produced by the image-handling devices are similar, by: first converting means for converting an RGB value to a first XYZ value; second converting means for converting the first XYZ value to a first LMS value; third converting means for converting the first LMS value to a first X op Y op Z op value for use in an optical color space; first performing means for performing image editing processing on the first X op Y op Z op value to obtain a L S a S b S value; second performing means for performing image editing processing on the L S a S b S value; fourth converting means for converting the edited L S a S b S value to a second X op Y op Z op value; fifth converting means for converting the second X op Y op Z op value to a second LMS value for use in a LMS color space; sixth converting means for converting the second LMS value to a second XYZ value; and seventh converting means for converting the second XYZ value to a CMY value; wherein image data processing in the optical color space does not depend on a dynamic range of the image-handling devices.
2. A method of processing image data input from an image-handling device before the image data is output to another image-handling device, said method comprising the step of: correcting the image data, such that colors of the image data produced by the image-handling devices are similar, by: converting an RGB value to a first XYZ value; converting the first XYZ value to a first LMS value; converting the first LMS value to a first X op Y op Z op value for use in an optical color space; performing image editing processing on the first X op Y op Z op value to obtain a L S a S b S value; performing image editing processing on the L S a S b S value; converting the edited L S a S b S value to a second X op Y op Z op value; converting the second X op Y op Z op value to a second LMS value for use in a LMS color space; converting the second LMS value to a second XYZ value; and converting the second XYZ value to a CMY value; wherein image data processing in the optical color space does not depend on a dynamic range of the image-handling devices.
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December 6, 1999
June 28, 2005
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